Washington, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.2 °F (low) to 61 °F (high). Annual precipitation averages 32.6 Inches. Washington is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 13.7 °F | 32.0 °F | 0.76 in. |
| February | 17.5 °F | 36.9 °F | 1.02 in. |
| March | 28.1 °F | 49.4 °F | 1.79 in. |
| April | 39.0 °F | 62.0 °F | 3.23 in. |
| May | 51.0 °F | 72.3 °F | 4.75 in. |
| June | 61.9 °F | 82.4 °F | 5.13 in. |
| July | 65.7 °F | 85.7 °F | 3.51 in. |
| August | 63.2 °F | 83.7 °F | 4.05 in. |
| September | 53.9 °F | 77.6 °F | 3.19 in. |
| October | 41.3 °F | 64.7 °F | 2.45 in. |
| November | 28.7 °F | 49.2 °F | 1.39 in. |
| December | 18.6 °F | 36.3 °F | 1.3 in. |
| Annual | 40.2 °F | 61 °F | 32.57 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |